A patient is admitted for a total hip replacement because of rheumatoid arthritis. Following admission, but prior to surgery, the patient develops congestive heart failure, which necessitates transfer to ICU. The hip replacement is canceled and the patient is treated for the heart failure. What is the principal diagnosis?

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A patient is admitted for a total hip replacement because of rheumatoid arthritis. Following admission, but prior to surgery, the patient develops congestive heart failure, which necessitates transfer to ICU. The hip replacement is canceled and the patient is treated for the heart failure. What is the principal diagnosis?